212494939 has 4 divisors (see below), whose sum is σ = 212534656. Its totient is φ = 212455224.

The previous prime is 212494937. The next prime is 212494957. The reversal of 212494939 is 939494212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212494939 - 2¹ = 212494937 is a prime.

It is a super-2 number, since 2×212494939² = 90308198201227442, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212494895 and 212494904.

It is not an unprimeable number, because it can be changed into a prime (212494937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10299 + ... + 23044.

It is an arithmetic number, because the mean of its divisors is an integer number (53133664).

Almost surely, 2^212494939 is an apocalyptic number.

212494939 is a deficient number, since it is larger than the sum of its proper divisors (39717).

212494939 is an equidigital number, since it uses as much as digits as its factorization.

212494939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39716.

The product of its digits is 139968, while the sum is 43.

The square root of 212494939 is about 14577.2061452118. The cubic root of 212494939 is about 596.7368584998.

The spelling of 212494939 in words is "two hundred twelve million, four hundred ninety-four thousand, nine hundred thirty-nine".